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APA Citation
Kim, V., Williams, N., Ostridge, K., Barton, A., Wojtas, M., Aris, E., Peeters, M., Devaster, J., Bourne, S., & Wilkinson, T. (n.d.). s33 Sputum Colour In The Light Of The Health Related Quality Of Life, Airways And Systemic Biomarkers In Exacerbations Of Copd. Thorax, 69, A19–A20. http://access.bl.uk/ark:/81055/vdc_100134879021.0x000028